Centerpiece fish for a 20 gallon long

Title says it all. Looking for centerpiece fish for a 20 gallon long. I was hoping to put my plakat betta in here but we learned today he has a voracious appetite for shrimp. I was thinking a pair of rams I’ve never owned any before. I’m open to anything ☺️

Currently housing - 10 ember tetra - 3 kuhli loches - 1 otocinlus (he’s the last of his group 😢 not looking to add more) - 1 nerite snail - neocardina shrimp community